You didn't say what caused this to start?
Can you try this manual uninstall procedure? Let us know if you get any error along the way.
First run the davinci uninstaller.
Then
i) Stop the server.
sudo launchctl unload /Library/LaunchDaemons/com.edb.launchd.postgresql-8.4.plist
ii) Remove the plist file
sudo rm -f /Library/LaunchDaemons/com.edb.launchd.postgresql-8.4.plist
iii) Remove the Applications Menu.
sudo rm -f "/Applications/PostgreSQL 8.4"
iv) Remove the installation directory
sudo rm -rf /Library/PostgreSQL/8.4
v) Remove the 'postgres' user
sudo dscl . delete /Users/postgres
vi) Remove the ini file
sudo rm -f /etc/postgres-reg.ini
Then rerun the davinci installer.
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